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> At a given time, multiple people may be having the same idea.

Ahhh, now I get it. What you describe here is not an idea at all. It is just something to do. (We could also disagree how to measure quality. I can imagine great ideas that cant possibly work or just cant be profitable.)

In the games industry for example a real idea might look like Pong or table football but one could also argue those are just iterations of croquet. Maybe the real idea was the Mayan ballgame of Pitz and everything after it was just a slight modification.

Ideas range from bad to good but we each make our own definition.

Personally I'm looking for an idea similar to camp fire. The execution of a camp fire is cheap. Or take grilled meat or alcohol those are not cheap ideas!

Colonizing mars or a fusion reactor, those are cheap ideas. If you have ideas like that you need to do better.